perfSONAR User Q&A and Other Discussion

[Eli Dart <>]

I haven't seen this specifically, but this sort of issue looks like it might be a driver or firmware bug.

Are you able to change the version of the ixgbe driver you are using, or run different firmware on the card?  (I forget if those cards have separate firmware).

Eli

On Wed, Aug 12, 2015 at 10:01 AM, Lang, Michael <> wrote:

Hello,

 

I’ve been having trouble with a system running perfSONAR, specifically with the 10G NIC.  The system is a Dell PowerEdge R610 with an Intel X520 NIC installed into it.  The problem that I’m having is that with newer kernels there has been a consistent load of .5 on the system.  After troubleshooting this I found the load is likely from the kernel thread ‘events’ getting stuck in state ‘D’ (Uninterruptible sleep) often.  Looks like this from top:

 

   21 root      20   0     0    0    0 D  0.0  0.0   6:42.19 events/2

 

Another symptom (the one I first noticed) is that keystrokes are choppy through SSH – especially if events/0 is the one going to ‘D’.  If I pull the ixgbe driver from the system these problems go away. 

 

The last kernel that I had working that didn’t have this problem was:

 

2.6.32-504.16.2.el6.web100

 

The current kernel installed is:

 

2.6.32-573.1.1.el6.web100.x86_64

 

I’ve tried changing some available ixgbe parameters such as interrupts and flow director but it hasn’t helped.  The only parameter I’m currently running is to use unsupported transceivers, but I don’t believe that should cause this issue.

 

Has anyone else seen this?  Anyone know of a fix or anything I could try to help resolve it?

 

Thanks,

 

-          Mike

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